Originally Posted by
Sharklet
Hello,
I'm reviving this thread since I have a doubt on how to convert the 200 degrees of astigmatism to dioptres.
Astigmatism has both an orientation in degrees and a power in dioptres. Asking how to convert degrees to dioptres is a bit like asking how to convert heading to airspeed.
Originally Posted by
Sharklet
Is there a calculation to convert the dioptres at a specified angle to the requirements for a CAAS medical?
Bear in mind I'm just an engineer (not a pilot, nor an optometrist) who happens to own an altogether too interesting pair of eyes, which despite all their faults still work remarkably well.
I would be very surprised if the CAAS medical references the orientation angle of astigmatism. It doesn't really tell you anything useful about the severity of visual impairment. They will almost certainly only be interested in the power in dioptres of the astigmatism. The angle is needed to specify the corrective lenses, but does not give an indication of the degree of visual impairment.